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Measuring procedure
The measuring operation is started by setting the internal software release signal, or by setting the
hardware and software release signal if the digital input is configured as a hardware release.
Measuring is carried out within a definable integration time that can be adjusted via the control
interface/process output. The measured value is then updated.
After the integration time has elapsed, STS_MVAL indicates that an actual measured value is pres-
ent. This bit must be reset via the RES_STS status bit in the control interface.
Frequency measurement
Definition
In this operating mode the module counts the pulses received within a specified integration time.
The integration time can be set by a parameter or via the control interface/process output during
operation. It can be set in 10 ms increments to between 10 ms and 10 s.
The value of the determined frequency is made available as a 10
-3
Hz value. You can read the mea-
sured frequency value in the check-back interface/process input.
The displayed value cannot be updated until the integration time has elapsed.
Limit value monitoring
The limit values can be configured and defined at a later time via the control interface/process out-
put. The following limit value ranges are possible:
Range defined by parameters
The value range is restricted by the 3 byte parameter length
Lower limit n
u
is 0…16 777 214 × 10
-3
Hz
Upper limit
o
is 1…16 777 215 × 10
-3
Hz
The upper limit must be greater than the lower limit. The diagnostics messages ”upper limit wrong”
and ”lower limit wrong” indicate parameter definitions that are outside of the permissible value
range. The diagnostics messages are cleared when valid parameters are entered.
Range defined via the control interface/process output
(LOAD_UPLIMIT/LOAD_LOLIMIT)
Lower limit n
u
is 0…199 999 999 × 10
-3
Hz
Upper limit
o
is 1…200 000 000 × 10
-3
Hz
The upper limit must be greater than the lower limit. An error is indicated by the ERR_LOAD status
bit via the check-back interface/process input. The status bit is cleared when a valid value is entered.
Fig. 263: Frequency measurement with release function
Count
signals
Integration time
Start of
frequency measurement
End of
frequency measurement
n*10 ms n*10 ms
Internal
release
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